Module humanize 

Turn kopia’s raw stderr tail into a tight, operator-readable extract.

kopia prints a lot to stderr: a running progress meter (… 95.0% 12s left), per-shard bookkeeping, and — buried among it — the one line that actually explains the failure. The raw tail also carries per-attempt volatile fragments like .shards.tmp.9f3ac1, whose randomness is exactly what once caused a reconcile hot-loop when it leaked into a status condition.

humanize_tail extracts the salient error line(s), drops the progress noise, and strips the volatile temp fragments — deterministically, so the same failure always renders the same string. It feeds KopiaError’s Display (which flows to Warning Events, status.failure.message, and logs); the full raw tail is preserved separately in the error’s stderr_tail field for status.failure.stderrTail.

Pure string work only — no allocation-heavy regex crate, no new dependencies.

Functions

exit_code_desc

Render a process exit code for an operator, without the Some(1) Debug leak the old {code:?} interpolation produced.

humanize_tail

Extract the actionable part of a kopia stderr tail: drop progress/noise lines, strip volatile temp-path fragments, and keep at most the last few salient lines (newest last), joined with ; so the result stays a single line.